Do you have the rest of the front sight? if not, they are cheap. I am assuming you mean you need a taller blade? There are many different 1903 standard blade heights. If one of iis then not high enough, go the make one by hand. SS Firearms sells replacement (krag) blades. They sell a large square one https://www.ssfirearms.com/proddetail.asp?prod=K527A. The blade will be slightly thicker than the 1903 one, but just fit by rubbing it on a stone - like one you would sharpen something on. In fact, it's too wide even for their replacement krag base and must be carefully stoned to to the correct thickness ...ask how I know. Shape it to your desired dimensions